When comparing the same CPU, yes.... Higher GHz means better performance when compared to the same CPU core/architecture at a lower frequency. However, when comparing two different types of CPU's, clock speed is not a good indicator of performance... A core 2 duo running at 1.8GHz would smack around a Pentium 4 at 3.2 GHz.
Yes. GHz definitely matters. More GHz=more speed, definitely. The main thing to remember though is you need to compare like to like, ie AMD X2 to AMD X2 or X3 to X3 or Intel Exxx to Intel Exxx or Qxxx to Qxxx. If you want to compare for example Athlon X3 to Intel Q or something., then you need to study the CPU architectures also and in that scenario, GHz becomes one of many factors that need to be considered and not the sole factor as it can be when talking about same types of CPU.
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